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Experimental investigation of control updating period monitoring in industrial PLC-based fast MPC： Application to the constrained control of a cryogenic refrigerator

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Control Theory and Technology 2017年第2期15卷 92-108页

作者： Francois BONNE Mazen ALAMIR Patrick BONNAY Universite Grenoble Alpes INAC-SBT F-38000 Grenoble France CNRS Gipsa-lab Universite Grenoble Alpes F-3800 Grenoble France

In this paper, a complete industrial validation of a recently published scheme for on-line adaptation of the control updating period in model predictive control is proposed. The industrial process that serves in the validation is a cryogenic refrigerator that is used to cool the supra-conductors involved in particle accelerators or experimental nuclear reactors. Two recently predicted features are validated： the first states that it is sometimes better to use less efficient （per iteration） optimizer if the lack of efficiency is overmcompensated by an increase in the updating control frequency. The second is that for a given solver, it is worth monitoring the control updating period based on the on-line measured behavior of the cost function.

关键词： Fast MPC cryogenic refrigerators control updating period ODE-based optimization

In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

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Light(Science & Applications) 2021年第7期10卷 1326-1338页

作者： Chen Xie Remi Meyer Luc Froehly Remo Giust Francois Courvoisier Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technology of Ministry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin University300072 TianjinChina FEMTO-ST Institute Univ.Bourgogne Franche-ComtéCNRS15B avenue des Montboucons25030 Besançon CedexFrance

Ultrafast imaging is essential in physics and chemistry to investigate the femtosecond dynamics of nonuniform samples or of phenomena with strong spatial *** relies on observing the phenomena induced by an ultrashort laser pump pulse using an ultrashort probe pulse at a later *** years have seen the emergence of very successful ultrafast imaging techniques of single non-reproducible events with extremely high frame rate,based on wavelength or spatial frequency ***,further progress in ultrafast imaging towards high spatial resolution is hampered by the lack of characterization of weak probe *** pump–probe experiments realized within solids or liquids,because of the difference in group velocities between pump and probe,the determination of the absolute pump–probe delay depends on the sample *** addition,pulse-front tilt is a widespread issue,unacceptable for ultrafast imaging,but which is conventionally very difficult to evaluate for the low-intensity probe *** we show that a pump-induced micro-grating generated from the electronic Kerr effect provides a detailed in-situ characterization of a weak probe *** allows solving the two issues of absolute pump–probe delay determination and pulse-front tilt *** approach is valid whatever the transparent medium with nonnegligible Kerr index,whatever the probe pulse polarization and *** it is nondestructive and fast to perform,this in-situ probe diagnostic can be repeated to calibrate experimental conditions,particularly in the case where complex wavelength,spatial frequency or polarization encoding is *** anticipate that this technique will enable previously inaccessible spatiotemporal imaging in a number of fields of ultrafast science at the micro-and nanoscale.

关键词： pump polarization laser

Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas

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Light(Science & Applications) 2019年第1期8卷 486-493页

作者： Mengjia Wang Roland Salut Huihui Lu Miguel-Angel Suarez Nicolas Martin Thierry Grosjean FEMTO-ST Institute UMR 6174 Univ.Bourgogne Franche-Comte CNRSBesanconFrance Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China

Light polarization control is a key factor in modern *** advances in surface plasmon manipulation have introduced the prospect of more compact and more efficient devices for this ***,the current plasmonic-based polarization optics remain much larger than the wavelength of light,which limits the design degrees of ***,we present a plasmonic traveling-wave nanoantenna using a gold-coated helical carbon nanowire end-fired with a dipolar aperture *** nonresonant helical nanoantenna enables tunable polarization control by swirling surface plasmons on the subwavelength scale and taking advantage of the optical spin–orbit *** closely packed helical traveling-wave nanoantennas(HTNs)are demonstrated to locally convert an incoming light beam into four beams of tunable polarizations and intensities,with the ability to impart different polarization states to the output beams in a controllable ***,by near-field coupling four HTNs of opposite handedness,we demonstrate a subwavelength waveplate-like structure providing a degree of freedom in polarization control that is unachievable with ordinary polarization optics and current metamaterials.

关键词： polarization antenna optics

Dynamic full-field optical coherence tomography:3D live-imaging of retinal organoids

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Light(Science & Applications) 2020年第1期9卷 665-673页

作者： Jules Scholler Kassandra Groux Olivier Goureau Jose-Alain Sahel Mathias Fink Sacha Reichman Claude Boccara Kate Grieve Institut Langevin ESPCI ParisPSL UniversityCNRS10 rue VauquelinParisFrance Institut de la Vision Sorbonne UniversiteINSERMCNRSF-75012 ParisFrance Quinze-Vingts National Eye Hospital 28 Rue de CharentonParis 75012France Fondation Ophtalmologique Rothschild F-75019 ParisFrance Department of Ophthalmology The University of Pittsburgh School of MedicinePittsburghPA 15213United States

Optical coherence tomography offers astounding opportunities to image the complex structure of living tissue but lacks functional *** present dynamic full-field optical coherence tomography as a technique to noninvasively image living human induced pluripotent stem cell-derived retinal *** images with an endogenous contrast linked to organelle motility are generated,with submicrometre spatial resolution and millisecond temporal resolution,creating a way to identify specific cell types in living tissue via their function.

关键词： optical function image

Thermoelectric properties of high-entropy rare-earth cobaltates

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Journal of Materiomics 2023年第1期9卷 191-196页

作者： Ashutosh Kumar Diana Dragoe David Berardan Nita Dragoe ICMMO(UMR CNRS 8182) University of Paris-SaclayOrsay91405France

High-entropy concept introduced with a promising paradigm to obtain exotic physical properties has motivated us to explore the thermoelectric properties of Sr-substituted high-entropy rare-earth cobaltates i.e.,(LaNdPrSmEu)_(1-x)Sr_(x)CoO_(3)(0≤x≤0.10).The structural analysis of the samples,synthesized using the standard solid-state route,confirms the orthorhombic structure with the Pbnm space *** Seebeck coefficient and electrical resistivity decrease with rising Sr concentration as well as with an increase in *** multiple A-site ions in high-entropy rare-earth cobaltates result in an improved Seebeck coefficient(α)compared to La_(0.95)Sr_(0.05)CoO_(3),associated with a decrease in the Cosingle bondOsingle bondCo bond angle,which further enhances the power *** random distribution of cations at the rare-earth site results in a significant lowering of phonon thermal *** a result,a maximum figure of merit(zT)of 0.23 is obtained at 350K for(LaNdPrSmEu)_(0.95)Sr_(0.05)CoO_(3),which is one of the highest values of zT reported at this temperature for oxide *** study shows promise to decouple thermoelectric parameters using the high-entropy concept in several materials.

关键词： materials. temperature. entropy

Mechanisms of electrochemical magnesium(de)alloying of Mg-Sn and Mg-Pb polymorphs

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Journal of Magnesium and Alloys 2022年第6期10卷 1609-1616页

作者： Clément Pechberty Antoine Klein Bernard Fraisse Lorenzo Stievano Romain Berthelot ICGM CNRSUniv.MontpellierENSCMMontpellierFrance RS2E CNRSHub de l’EnergieAmiensFrance

Different polymorphs of Mg-Sn and Mg-Pb intermetallic compounds were prepared by high-energy mechanical alloying and then investigated as active material in magnesium batteries. Beside thermodynamically stable Mg_(2)Sn and Mg_(2)Pb crystallizing in the anti-fluorite structure, other polymorphs Mg_(~2)Sn and Mg_(~2)Pb were prepared by increasing the ball-milling time. The first dealloying process is almost complete only for the cubic polymorphs, then similar capacities are observed during the subsequent alloying and dealloying *** to operando X-ray diffraction, the electrochemical mechanism is revealed and shows that the cubic polymorphs Mg_(2)Sn and Mg_(2)Pb tend to preferentially form during the alloying whatever the pristine intermetallic. Weak traces of Mg_(~2)Sn and Mg_(~2)Pb are observed during the alloying, suggesting that these polymorphs act as a by-product and/or an intermediate phases of the electrochemical process. Finally, the compatibility of cubic Mg_(2)Sn and Mg_(2)Pb with Mg(TFSI)_(2)-based electrolyte is confirmed in full cell vs. a positive electrode based on the Chevrel phase Mo6S8, although limited performance is achieved. This fundamental work provides new insights in the behavior of alloy-type negative electrodes for magnesium-ion batteries.

关键词： Magnesium batteries Alloy electrode Mechanochemistry Operando X-ray diffraction

Comparative effects of α2δ-1 ligands in mouse models of colonic hypersensitivity

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World Journal of Gastroenterology 2016年第31期22卷 7111-7123页

作者： Mathieu Meleine Ludivine Boudieu Agathe Gelot Emilie Muller Amandine Lashermes Julien Matricon Celine Silberberg Vassilia Theodorou Alain Eschalier Denis Ardid Frederic A Carvalho Clermont Université Université d'Auvergne INSERM 1107 Neuro-Dol Université d’Auvergne INSERM 1107 Neuro-Dol INRA EI-Purpan UMR 1054 Neuro-Gastroenterology and Nutrition

AIM: To investigate anti-hypersensitive effects of α2δ-1 ligands in non-inflammatory and inflammationassociated colonic hypersensitivity(CHS) mouse ***: To induce an inflammation-associated CHS, 1% dextran sulfate sodium(DSS) was administered to C57Bl/6J male mice, in drinking water, for 14 d. Regarding the non-inflammatory neonatal maternal separation(NMS)-induced CHS model, wild-type C57BI/6J pups were isolated from their mother from day 2 to day 14(P2 to P14), three hours per day(from 9:00 a.m. to 12:00 p.m.). Colorectal distension was performed by inflating distension probe from 20 μL to 100 μL by 20 μL increment step every 10 s. After a first colorectal distension(CRD), drugs were administered subcutaneously, in a cumulative manner,(Gabapentin at 30 mg/kg and 100 mg/kg; Pregabalin at 10 mg/kg and 30 mg/kg; Carbamazepine at 10 mg/kg and 30 mg/kg) and a second CRD was performed one hour after each ***: The visceromotor response(VMR) to CRD was increased by our NMS paradigm protocol in comparison to non-handled(NH) mice, considering the highest distension volumes(80 μL: 0.783 ± 0.056 mV /s vs 0.531 ± 0.034 m V/s, P < 0.05 and 100 μL: 1.087 ± 0.056 m V/s vs 0.634 ± 0.038 m V/s, P < 0.05 for NMS and NH mice, respectively). In the inflammationassociated CHS, DSS-treated mice showed a dramatic and significant increase in VMR at 60 and 80 μL distension volumes when compared to control mice(60 μL: 0.920 ± 0.079 m V/s vs 0.426 ± 0.100 m V/s P < 0.05 and 80 μL: 1.193 ± 0.097 mV /s vs 0.681 ± 0.094 mV /s P < 0.05 for DSS- and Water-treated mice, respectively). Carbamazepine failed to significantly reduce CHS in both models. Gabapentin significantly reduced CHS in the DSS-induced model for both subcutaneous injections at 30 or 100 mg/kg. Pregabalin s i g n i f i c a n t l y r e d u c e d V M R t o C R D i n t h e n o n-inflammatory NMS-induced CHS model for the acute subcutaneous administration of the highest cumulative dose(30 mg/kg) and significan

关键词： Neonatal maternal separation Dextran sulfate sodium Colonic hypersensitivity mouse models Colorectal distension α2δ-1 ligands

Macroscale fluorescence imaging against autofluorescence under ambient light

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Light(Science & Applications) 2018年第1期7卷 151-162页

作者： Ruikang Zhang Raja Chouket Marie-Aude Plamont Zsolt Kelemen Agathe Espagne Alison G.Tebo Arnaud Gautier Lionel Gissot Jean-Denis Faure Ludovic Jullien Vincent Croquette Thomas Le Saux PASTEUR Département de ChimieÉcole Normale SupérieurePSL UniversitySorbonne UniversitéCNRS75005 ParisFrance Institut Jean-Pierre Bourgin INRAAgroParisTechCNRSSaclay Plant Science(SPS)UniversitéParis-SaclayVersaillesFrance Laboratoire de Physique Statistique École Normale SupérieurePSL Research UniversityUniversitéParis Diderot Sorbonne Paris-CitéSorbonne UniversitéCNRS75005 ParisFrance Institut de biologie de l’École normale supérieure(IBENS) École Normale SupérieureCNRSINSERMPSL Research University75005 ParisFrance

Macroscale fluorescence imaging is increasingly used to observe biological ***,it may suffer from spectral interferences that originate from ambient light or autofluorescence of the sample or its *** this manuscript,we built a simple and inexpensive fluorescence macroscope,which has been used to evaluate the performance of Speed OPIOM(Out of Phase Imaging after Optical Modulation),which is a reference-free dynamic contrast protocol,to selectively image reversibly photoswitchable fluorophores as labels against detrimental autofluorescence and ambient *** tuning the intensity and radial frequency of the modulated illumination to the Speed OPIOM resonance and adopting a phase-sensitive detection scheme that ensures noise rejection,we enhanced the sensitivity and the signal-to-noise ratio for fluorescence detection in blot assays by factors of 50 and 10,respectively,over direct fluorescence observation under constant ***,we overcame the strong autofluorescence of growth media that are currently used in microbiology and realized multiplexed fluorescence observation of colonies of spectrally similar fluorescent bacteria with a unique configuration of excitation and emission ***,we easily discriminated fluorescent labels from the autofluorescent and reflective background in labeled leaves,even under the interference of incident light at intensities that are comparable to *** proposed approach is expected to find multiple applications,from biological assays to outdoor observations,in fluorescence macroimaging.

关键词： ambient illumination light

A study on wildfire impacts on greenhouse gas emissions and regional air quality in South of Orléans,France

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Journal of Environmental Sciences 2024年第1期135卷 521-533页

作者： Chaoyang Xue Gisèle Krysztofiak Yangang Ren Min Cai Patrick Mercier Frédéric Le Fur Corinne Robin Benoit Grosselin Véronique Daele Max RMcGillen Yujing Mu Valéry Catoire Abdelwahid Mellouki Laboratoire de Physique et Chimie de l’Environnement et de l’Espace(LPC2E) CNRS–UniversitéOrléans–CNES(UMR 7328)Orléans Cedex 245071France Institut de Combustion AérothermiqueRéactivitéEnvironnement(ICARE)CNRSOrléans Cedex 245071France Research Centre for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Lig’Air-Association de surveillance de la qualitéde l’air en région Centre-Val de Loire Saint-Cyr-en-Val 45590France Mohammed V University RabatMorocco

Wildfire events are increasing globally which may be partly associated with climate change,resulting in significant adverse impacts on local,regional air quality and global *** September 2020,a small wildfire(burned area:36.3 ha)event occurred in Souesmes(Loiret-Cher,Sologne,France),and its plume spread out over 200 km on the following day as observed by the MODIS *** on measurements at a suburban site(~50 km northwest of the fire location)in Orléans and backward trajectory analysis,young wildfire plumes were *** increases in gaseous pollutants(CO,CH_(4),N_(2)O,VOCs,etc.)and particles(including black carbon)were found within the wildfire plumes,leading to a reduced air *** factors,defined as EF(X)=ΔX/ΔCO(where,X represents the target species),of various trace gases and black carbon within the young wildfire plumes were determined accordingly and compared with previous *** in the ambient ions(such as ammonium,sulfate,nitrate,chloride,and nitrite in the particle-and gasphase)and aerosol properties(e.g.,aerosol water content,aerosol p H)were also quantified and ***,we estimated the total carbon and climate-related species(e.g.,CO_(2),CH_(4),N_(2)O,and BC)emissions and compared them with fire emission *** biomass burning emission inventories have uncertainties in estimating small fire burned areas and *** instance,we found that the Global Fire Assimilation System(GFAS)may underestimate emissions(e.g.,CO)of this small wildfire while other inventories(GFED and FINN)showed significant *** that it is the first time to record wildfire plumes in this region,related atmospheric implications are presented and discussed.

关键词： Wildfire Air quality Emission factor Emission inventory VOLTAIRE supersite